Circle Opens Arc Mainnet With USDC Paying Transaction Fees and BlackRock Among Eleven Validators

Circle opened the mainnet of Arc, its own layer-1 blockchain, on Tuesday. The defining design choice is that USDC, Circle's dollar stablecoin, serves as the native fee asset, so a user spends the same balance for payments and for gas and never has to hold a separate volatile token to move money.

The technical stack is conventional and fast. Arc runs a Byzantine fault tolerant consensus engine derived from Tendermint with sub-second finality, and an execution layer compatible with the Ethereum Virtual Machine, with fees denominated in USDC. Circle says the network launched with more than 100 applications and 22 fiat-linked stablecoins available on day one.

The validator set is where Arc departs from the chains it competes with. The founding operators include BlackRock, the Depository Trust and Clearing Corporation, Galaxy, Global Payments, Intercontinental Exchange, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation and Visa. That is a settlement consortium with a blockchain attached, not a permissionless network, and it should be described as such. The tradeoff is explicit: institutional counterparties get known validators and predictable fees, and users give up the censorship resistance that comes from an open validator market.

Circle currently trails Tether in stablecoin distribution. USDC circulates at $73.77 billion against Tether's $183.24 billion, out of $310.89 billion in total stablecoin supply, according to DeFiLlama. Distribution keeps widening elsewhere too, with Upbit adding trading support for PayPal USD and the yen-linked JPYC across its won, bitcoin and tether markets. Arc will only matter if real payment volume settles there rather than on the chains that already hold the balances.